Gamma-ray burst jet propagation, development of angular structure, and the luminosity function
Journal
Date Issued
2020
Author(s)
Description
O. S. acknowledges the MIUR (Italian Ministry of University and Research) grant “FIGARO” (1.05.06.13) for support. S. A. acknowledges the GRAvitational Wave Inaf TeAm - GRAWITA (P.I. E. Brocato) for support.
Abstract
The fate and observable properties of gamma-ray burst jets depend crucially
on their interaction with the progenitor material that surrounds the central
engine. We present a semi-analytical model of such interaction, which builds
upon several previous analytical and numerical works, aimed at predicting the
angular distribution of jet and cocoon energy and Lorentz factor after
breakout, given the properties of the ambient material and of the jet at
launch. Using this model, we construct synthetic populations of structured
jets, assuming either a collapsar (for long gamma-ray bursts -- LGRBs) or a
binary neutron star merger (for short gamma-ray bursts -- SGRBs) as progenitor.
We assume all progenitors to be identical, and we allow little variability in
the jet properties at launch: our populations therefore feature a
quasi-universal structure. These populations are able to reproduce the main
features of the observed LGRB and SGRB luminosity functions, although several
uncertainties and caveats remain to be addressed.
Volume
636
Start page
A105
Issn Identifier
0004-6361
Ads BibCode
2020A&A...636A.105S
Rights
open.access
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